Machine for mixing flour and other materials.



I. BENJAMINS. MACHINE FOR MIXING FLOUR AND OTHER MATERIALS. APPLICATION mm DECAL 1911.

1 ,268,8 1 3. Patented June 11, 1918.

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ce's drama to" said 0r choking of the flour or he shaft 23 carries at its lower I OthBQ IIlfltGl'iBl which is-bermgmixedi hood 26 which may he fastencd to thesheft '25 lhird: To improve the operation of mix- 23 so as to revolve therewith and to i stream ffiomr '80v ing hv providing a means for systematically the step hearifigQG from the'-' .circlfiating the materials which are hoing I or other mm'ei'ieiewliich is beingInilted.

mixed during the operation of saidmixing To prevent the jamming'or cholfihgpf the screw. e f ngixed materials and to produce the c'ircl'xle- Fourth: Tgdprovide'a means'for tion of the 88.13%): provide the sdriea qf'eo out-the mix material from the center axigil conical giudes 15, 16', 17, Bond 3:9, 86 the, upper part of the casing, where it is wh ch ma be secured to the 11' in heaped up by the mixing scmw, toward the any sultah e manner, by the spaciog platis per 'hery of the casing, thereby reducing 34, 34.

w the eight of the casing employed,and there- The elements of said guides 15, '16, 17', 18

by aiding the said circulation of the material anq 19 he shown aepereilelto those of mini 00- in the machine. I casing 11, and said guide 19 s shown as 131."-

Fifth: To have Said'machine simple, duminetinget its low?!" endio the 1fiylimiricei rable and comparatively inexpensive. spout 20,whieh is coaxial withsa' spout 21.- B I attain these objects by the mechanism. Said spout 20.. ieehown as inoloemg the illustrated in the accompanying or part 14* of the mixing screw IA-4:15 and 15- b any mechemcei eqmvalent or reasonably the flgmces hetween'the a'ucceesive 15,

o golgmmgrdlfimon'lrof the same. 16;}1 18 andfli!) Iern inate qtitthzhnlowem fewirggt, i'gnre 1 is a vertieel en 3 opposite e portion 14 qscrew? sci-aw and sundry bearings thereof in eva- 'It'ie ewiiient' any mhtmahyyhengh V-tiom. A; ing down theinclmed w hetyveen The of my machine for mixing of sa'id- =-=wi1l, when lower perm the eomca! ca inside the casing- 1], will be prevented; and as the material is being raised by the screw 1l--1 4. and cliscl'iarged over the upper ends of said guides 15, .16, 17, 18 and 19, it Will 6 enter the spaces between said guides and continue to circulate with great regularity of motion; and he mixing operation W1 .1 thereby be greatly improved. The inclina-' tion of the elements of said guides 15, i6,

10 17, 18 and 19 is such as to prevent the lodgement of the mixed material thereon.

As to the advantages of said tapered screw 14, they are fully described in the above application of Albert A. Strauss.

The material which enters the space between said guide 19 and the inside of said casing 11, is directed downwardly through the annular space between the outside of said spout 20, and the inside of the spout 20 21, to the lower end of said spout 21 from which the material is raised by the part 1 of the screw l t-14" inside the spout 20, and propelled upward, receiving increments of material from the spaces between said 215 guides as it is made to ass over the blade of the portion 14 of sai screw l t-14.

The absence of jamming or choking of the material, naturally eliminates unnecessary friction of said mixing screw, and the sys- 80 tematic circulation of material improves the operation of mixing in general.

Instead of allowing the material to be heaped up in the center of the up or part of the casing 12, and then to gli 0 down sissidewise'by gravity at an angle exceeding the angle of repose of the material, as described in the above application of Albert A. Strauss, I provide the impeller 30, which is shown-as connected to the shaft 23 by means 40 of the hub 31, which may be fastened to said shaft by suitable set screws or keys; the said impeller is similar in shape to the impellers of centrifugal pumps, and I prefer to have the blades curved rearwardly, so as to act on the material not only by means of the centrifugal force, but also to have a component of its motion tendin to propel the material radially outward rpm, the center of the machine.

o0 The said impeller 30 may be made to run at a different angular seed than that of "the shai't 23, if desired, y permitting said 1 hub 31 to slide on said shaft 23 and actusia 1 ing said impeller 30 by means of suitable 5E gearing not shown in the drawings.

It is evident that the mixed material will be spread out laterally by said impeller 30 as fast as it is heaped up by the screw 1414 and propelled over the upper ends of: said guides 15,16, 17, 18 and 19, causing it to enter the spaces between said guides and to circulate as abo e described,

The height of the casing 12 may, there fore, bereduced considerably, as is evident from the drawing in this application as com pared with that of the above application of the said Albert A. Strauss.

The hood 26 is shown as curved in outline, thereby Ofl'el'illg the least resistance to the passage of mixed material from the annular space inclosed between the inside of said spout 21 and the outside of said spout 20 toward the discharge mouth 22.

The action of the gate 27 is the same as described in the above application of said Albert A. Strauss, so is the method of charging the mixing machine and of recharging the same, if necessary.

Many changes could be made in the details of the above mixing machine Within the scope of my invention.

I do not therefore restrict myself to the details as shown in the drawings, but I intend to include also all. mechanical equivalents and reasonably obvious modifications of the same.

l/Vhat I claim as my invention and desire to secure by Letters Patent, is:

l. In a machine for mixing flour and other materials, an outer casing, a mixing screw and one or more guides adapted to direst the mixed material from the discharge end of said screw to a point or points of the working surface of said screw.

2. In a in achinefor mixing flour and other materials, an outer casing, a. mixing screw and one or more guides coaxial with said screw, said guides being adapted to direct the mixed material from the discharge end of said screw to a point or points of the working surface of said screw.

3. In a machine for mixing Hour and other materials, an outer casing, a mixing screw and one or more guides coaxial with said screw, said guides being adapted to direct the mixed material from the discharge end of said screw to a. point or points of the working surface of said screw, said screw comprising a. tapered portion near the discharfge end thereof and a portion having the orm of an Archimedean screw near the intake end thereof, one of said guides having a spout adapted to encompass said Archimedean screw and said outer casing having an and adapted to encompass said spout, thereby directing'the material iassing between the said outer casing and said guide to the end of said spout, which is also the intake of said screw.

4. In a machine for mixing flour and other materials, an outer casing, a mixing screw on a vertical shaft and one or more guides coaxial with said screw, said guides being adapted to direct the mixed material from the discharge end of said screw to a point or points of the working surface of said screw, combined with an impeller operativcly connected to said screw, and

situated at the discharge end thereof, said rect the mixed material from the discharge 10 impeller being adapted to spread out the maend of said screw to a point or points of the terial in the upper end of the casing as it, is working surface of said 501 ew, combined being heaped u by the screw, thereby rewith means for spacing said guides with ducin the heig tof the heap. relation to each other and to said casing,

5. I n a machine for mixing flour and thereby keeping the same in a position co- 15 other materials, an outer casing, a mixing axially with said screw. screw and a pluralit of guides coaxial with said screw, said gui es being adapted to di ISRAEL BENJAMINS. 

